Cold energy recovery device and cold box

Abstract

The utility model provides a cold energy recovery device and a cold box, and relates to the technical field of energy recovery. The cold energy recovery device comprises a cold energy collection tank, a cold energy recovery device, a cold energy recovery device and a control device, and an inlet of the cold energy collection tank is connected to a cold energy discharge port of a cold box; the cold energy exchange pipe fitting comprises a cold energy exchange part, and the cold energy exchange part is arranged in the cold energy collection tank; an output port of the heat exchange gas source communicates with an inlet of the cold energy exchange part and conveys gas into the cold energy exchange part; and the molecular sieve is connected to the output port of the cooling capacity exchange part so as to convey the gas cooled by the cooling capacity exchange part to the molecular sieve. According to the cold energy recovery device, the residual cold energy is recovered for regeneration of the molecular sieve, so that the waste of cold energy resources is avoided.

Description

Technical Field

[0001] The present disclosure relates to the field of energy recovery technology, and in particular to a cold recovery device and a cold box. Background Art

[0002] In terms of industrial energy efficiency recovery, the liquid nitrogen washing process is a key link. It uses low-temperature liquid nitrogen to treat synthetic gas and effectively removes trace carbon monoxide, methane and other high-condensation-point impurities in the gas based on the differences in the condensation points of different gases.

[0003] When liquid nitrogen washing equipment is operated in a low-temperature environment, there will be excess cold in the cold box. In order to maintain the cold balance, some cold liquid has to be discharged. However, this external discharge operation not only wastes cold resources, but also causes the loss of raw hydrogen. From the perspective of long-term economic benefits, this method is not economically reasonable.

[0004] Therefore, the present application aims to provide a recovery device and a cold box that can recover the cold energy discharged by a cold box. Utility Model Content

[0005] A technical problem to be solved by the present disclosure is that when the liquid nitrogen washing equipment is operated in a low temperature environment, there will be an excess of cold in the cold box. In order to maintain the balance of cold, some cold liquid has to be discharged. However, this external discharge operation not only wastes cold resources, but also causes the loss of raw hydrogen. From the perspective of long-term economic benefits, this method is not economically reasonable.

[0006] To solve the above technical problems, the first aspect of the embodiments of the present disclosure provides a cold energy recovery device, which is applied to a cold box. The cold energy recovery device includes: a cold energy collection tank, the inlet of which is connected to the cold energy discharge port of the cold box, for collecting cold energy; a cold energy exchange pipe, which includes a cold energy exchange part and the cold energy exchange part is arranged in the cold energy collection tank; a heat exchange gas source, the output port of which is connected to the inlet of the cold energy exchange part and transports gas to the cold energy exchange part; and a molecular sieve, which is connected to the output port of the cold energy exchange part to transport the gas cooled by the cold energy exchange part to the molecular sieve.

[0007] In some embodiments, the cold recovery device also includes: a gas heating element, whose input port is connected to the outlet of the cold collection tank, for heating the gas output from the outlet; and a combustion element, whose input port is connected to the output port of the gas heating element.

[0008] In some embodiments, the cold recovery device also includes: an air temperature measuring meter, which is arranged at the output end of the gas heating element and is used to measure the temperature of the gas output by the gas heating element.

[0009] In some embodiments, the cold exchange part is a continuous spirally arranged pipe unit, and the pipe unit is in a spiral ascending or spiral descending shape to form a spiral pipe.

[0010] In some embodiments, the cold energy recovery device further includes: a liquid level meter, whose sensing end is in contact with the liquid in the cold energy collection tank and is used to detect the liquid level of the liquid.

[0011] In some embodiments, the cold energy recovery device further includes: a pressure gauge, which is arranged in the pipeline between the gas heating element and the cold energy collection tank, and is used to monitor the pressure of the cold energy collection tank.

[0012] In some embodiments, the cold recovery device further includes: a stop valve disposed at the output end of the heat exchange gas source.

[0013] In some embodiments, the cold recovery device further includes: a check valve, which is arranged at the output end of the stop valve.

[0014] In some embodiments, the pipeline between the heat exchange gas source and the cold energy collection tank, and the pipeline between the cold energy collection tank and the molecular sieve are low-temperature pressure-resistant stainless steel pipelines.

[0015] A second aspect of an embodiment of the present application provides a cold box, comprising: a cold energy recovery device as described above.

[0016] Through the above technical scheme, the present disclosure provides a cold recovery device and a cold box, which includes a cold collection tank, a cold exchange pipe, a heat exchange gas source and a molecular sieve. The inlet of the cold collection tank is connected to the cold discharge port of the cold box, and the excess cold is stored in the cold collection tank. The cold exchange part of the cold exchange pipe is located in the cold collection tank. The output port of the heat exchange gas source is connected to the inlet of the cold exchange part and transports gas to the cold exchange part. When the gas reaches the cold exchange part, the gas in the cold exchange part exchanges heat with the cold in the cold collection tank. After that, the gas after cooling is transported to the molecular sieve through the output port of the cold exchange part for the regeneration of the molecular sieve. The cold recovery device avoids the waste of cold resources by recycling the remaining cold for the regeneration of the molecular sieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural schematic diagram of a cold recovery device disclosed in an embodiment of the present disclosure.

[0019] Description of reference numerals:

[0020] 1. Cold collection tank; 2. Cold box; 3. Cold exchange part; 4. Heat exchange gas source; 5. Molecular sieve; 6. Gas heating element; 7. Combustion element; 8. Air temperature measuring meter; 9. Liquid level meter; 10. Pressure gauge; 11. Shut-off valve; 12. Check valve; 13. Regulating valve; 14. Remote temperature meter 14. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0022] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0023] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0024] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0025] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0026] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0027] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0028] When the liquid nitrogen washing equipment is operated in a low temperature environment, there will be an excess of cold in the cold box 2. In order to maintain the balance of cold, the operator usually discharges the cold. The inventor wants to use the discharged cold for the regeneration of the molecular sieve to save cold resources and reduce the loss of hydrogen.

[0029] Embodiment 1

[0030] In order to solve the above technical problems, the first aspect of the embodiment of the present disclosure provides a cold energy recovery device, which is applied to the cold box 2, and the cold energy recovery device includes: a cold energy collection tank 1, the inlet of the cold energy collection tank 1 is connected to the cold energy discharge port of the cold box 2, and is used to collect cold energy; a cold energy exchange pipe, which includes a cold energy exchange part 3 and the cold energy exchange part 3 is arranged in the cold energy collection tank 1; a heat exchange gas source 4, whose output port is connected to the inlet of the cold energy exchange part 3 and transports gas to the cold energy exchange part 3; and a molecular sieve 5, which is connected to the output port of the cold energy exchange part 3 to transport the gas cooled by the cold energy exchange part 3 to the molecular sieve 5.

[0031] Specifically, Figure 1As shown, the shape and size of the cold collection tank 1 can be set according to actual needs, and the shape and size of the cold collection tank 1 are not specifically limited here. The number of inlets of the cold collection tank 1 can be any number, such as: 1, 3 or 5, etc., and the cold collection tank 1 can be connected to the cold discharge ports of multiple cold boxes 2 at the same time. The cold exchange part 3 of the cold exchange pipe is located in the cold collection tank 1. In order to speed up the utilization efficiency of cold energy, the cold collection tank 1 can accommodate multiple cold exchange parts 3 at the same time. The specific shape of the cold exchange part 3 can be set according to actual needs, such as: a circular tubular structure, a square tubular structure or a structure of other shapes with a containing cavity. The gas output by the heat exchange gas source 4 can be specifically low-pressure nitrogen, which is used for regeneration cooling of the molecular sieve 5. The number of molecular sieves 5 at the output port of the cold exchange part 3 can be set according to actual needs, and one molecular sieve 5 or multiple molecular sieves 5 can be set, etc., and the number of molecular sieves 5 is not specifically limited here. In addition, a remote temperature meter 14 is provided at the input end of the molecular sieve 5, which can monitor in real time whether the nitrogen cooled by the cold exchange part 3 reaches the target temperature. The cold discharged from the cold collection tank 1 includes but is not limited to cryogenic liquid.

[0032] The present disclosure provides a cold recovery device and a cold box 2, which includes a cold collection tank 1, a cold exchange pipe, a heat exchange gas source 4 and a molecular sieve 5. The inlet of the cold collection tank 1 is connected to the cold discharge port of the cold box 2, and the excess cold is stored in the cold collection tank 1. The cold exchange part 3 of the cold exchange pipe is located in the cold collection tank 1. The output port of the heat exchange gas source 4 is connected to the inlet of the cold exchange part 3 and transports gas to the cold exchange part 3. When the gas reaches the cold exchange part 3, the cold in the cold collection tank 1 is used for cooling. The gas performs heat exchange with the cold in the cold collection tank 1 in the cold exchange part 3, and then the gas after cooling is transported to the molecular sieve 5 through the output port of the cold exchange part 3 for regeneration of the molecular sieve 5. The cold recovery device avoids the waste of cold resources by recycling the remaining cold for regeneration of the molecular sieve 5.

[0033] In some embodiments, the cold recovery device also includes: a gas heating element 6, whose input port is connected to the outlet of the cold collection tank 1, and is used to heat the gas output from the outlet; a combustion element 7, whose input port is connected to the output port of the gas heating element 6.

[0034] Specifically, Figure 1As shown, in order to recover the gas generated after the heat exchange between the cold in the cold collection tank 1 and the cold exchange part 3, the cold recovery device also includes a gas heating part 6 and a combustion part 7. The combustion part 7 can be a torch, and the gas heating part 6 can be a torch gas heater. Among them, the specific position of the air outlet of the cold collection tank 1 can be set at the top or side of the cold collection tank 1. The number of air outlets corresponds to the number of gas heating components. The number of air outlets, gas heating components and combustion parts 7 can be any number, which is not specifically limited here. A gas recovery device can also be set at the output port of the gas heating component to recover the heated gas and use the recovered gas as a fuel for combustion. By setting the cold exchange part 3 in the cold collection tank 1, the cold is heat exchanged inside the cold collection tank 1. The gas temperature generated in this process is relatively high, so that the additional energy required to be input in the subsequent gas heating link is reduced, thereby reducing energy consumption and improving the energy efficiency of the overall device.

[0035] In some embodiments, the cold recovery device further includes: an air temperature measuring meter 8, which is arranged at the output end of the gas heating element 6 and is used to measure the temperature of the gas output by the gas heating element 6.

[0036] Specifically, Figure 1 As shown, the air temperature measuring meter 8 is arranged at the output end of the gas heating element 6, and is used to measure the temperature change of the gas after being heated by the gas heating element 6. The air temperature measuring meter 8 reflects in real time whether the heated gas has reached the preset working temperature requirement. The air temperature measuring meter 8 is specifically a high-precision temperature sensor device, such as: a resistance temperature detector, a thermocouple or an infrared thermometer.

[0037] In some embodiments, the cold exchange part 3 is a continuous spirally arranged pipe unit, and the pipe unit is in a spiral ascending or spiral descending shape to form a spiral pipe.

[0038] Specifically, Figure 1 As shown, the pitch and diameter of the pipe unit can be set according to actual needs, and no specific limitation is made here. The pipe unit can be a spirally ascending pipe or a spirally descending pipe. Designing the cold exchange part 3 as a spiral structure can make full use of the space of the cold collection tank 1 and increase the heat exchange area.

[0039] In some embodiments, the cold energy recovery device further includes: a liquid level meter 9, whose sensing end is in contact with the liquid in the cold energy collection tank 1, and is used to detect the liquid level of the liquid.

[0040] Specifically, Figure 1As shown, the liquid level meter 9 can use a high-precision electric float liquid level meter 9, whose sensing end is in direct contact with the liquid in the cold collection tank 1. The liquid level meter 9 uses the principle that the float moves up and down with the change of liquid level, and converts it into an electrical signal through the internal transmitter to monitor and transmit the liquid level information in real time.

[0041] In some embodiments, the cold energy recovery device further includes: a pressure gauge 10 , which is disposed in a pipeline between the gas heating element 6 and the cold energy collection tank 1 and is used to monitor the pressure of the cold energy collection tank 1 .

[0042] Specifically, Figure 1 As shown, the specific installation position of the pressure gauge 10 can be close to the cold collection tank 1, or close to the gas heating element 6 or located between the cold collection tank 1 and the gas heating element 6. In order to facilitate the measurement of the pressure of the cold collection tank 1, the pressure gauge 10 is set on the side close to the cold collection tank 1. The type of the pressure gauge 10 is not specifically limited here, and can be selected according to actual needs. By setting the pressure gauge 10, dynamic monitoring of the pressure of the cold collection tank 1 is achieved. By observing the pressure gauge 10 and the liquid level gauge 9, it can be judged whether the gas volume of the molecular sieve 5 released into the cold collection tank 1 has reached the maximum pressure bearing value of the cold collection tank 1. If the pressure in the cold collection tank 1 is too large or the liquid level is too high, the opening of the regulating valve 13 at the input end of the molecular sieve 5 is reduced to reduce the pressure in the cold collection tank 1; if the pressure in the cold collection tank 1 does not exceed the maximum value of the pressure in the cold collection tank 1 or the liquid level fluctuation is small, the opening of the regulating valve 13 at the input end of the molecular sieve 5 can be appropriately increased to accelerate the cooling and regeneration of the molecular sieve 5.

[0043] In some embodiments, the cold recovery device further includes: a stop valve 11 , which is arranged at the output end of the heat exchange gas source 4 .

[0044] Specifically, Figure 1 As shown, the stop valve 11 is arranged at the output end of the heat exchange gas source 4, and is used to control the opening and closing of the gas flow to the cold exchange part 3. The stop valve 11 can be operated manually, electrically or pneumatically to meet different control requirements. By setting the stop valve 11, the output of the heat exchange gas source 4 can be accurately controlled, and the gas source can be quickly cut off in abnormal situations, thereby improving the safety of the cooling device.

[0045] In some embodiments, the cold recovery device further includes: a check valve 12 disposed at the output end of the stop valve 11 .

[0046] Specifically, Figure 1As shown, the check valve 12 is arranged at the output end of the stop valve 11. The type of the check valve 12 is not specifically limited here, and can be arranged according to actual needs. The check valve 12 automatically closes when the airflow direction changes to prevent the medium from flowing back and protect the heat exchange gas source 4 from being damaged. The check valve 12 can be adjusted manually or automatically to adapt to different working conditions and protect the cold recovery device from being damaged by backflow.

[0047] In some embodiments, the pipeline between the heat exchange gas source 4 and the cold energy collection tank 1, and the pipeline between the cold energy collection tank 1 and the molecular sieve 5 are low-temperature pressure-resistant stainless steel pipelines.

[0048] Specifically, Figure 1 As shown, since the gas output by the heat exchange gas source 4 is a low-pressure gas, in order to prevent the pipeline from being damaged, the pipeline between the heat exchange gas source 4 and the cold collection tank 1, and the pipeline between the cold collection tank 1 and the molecular sieve 5 are made of low-temperature pressure-resistant stainless steel pipelines. The specific material used for the pipeline can be a material such as 304L or 316L stainless steel that has low-temperature toughness, corrosion resistance, and can withstand temperature changes and pressure fluctuations during the transmission of low-pressure gas. The use of low-temperature pressure-resistant stainless steel pipelines not only effectively solves the safety problem in the low-pressure gas transmission process, but also improves the reliability and energy efficiency of the entire device, and reduces the maintenance cost and shutdown risk caused by pipeline damage.

[0049] Embodiment 2

[0050] A second aspect of an embodiment of the present application provides a cold box 2, comprising: a cold energy recovery device as described above.

[0051] The second aspect of the present application provides a cold box 2, comprising a cold recovery device as described above, the cold recovery device comprising a cold collection tank 1, a cold exchange pipe, a heat exchange gas source 4 and a molecular sieve 5. The inlet of the cold collection tank 1 is connected to the cold discharge port of the cold box 2, and the excess cold is stored in the cold collection tank 1, and the cold exchange part 3 of the cold exchange pipe is located in the cold collection tank 1. The output port of the heat exchange gas source 4 is connected to the inlet of the cold exchange part 3 and transports gas to the cold exchange part 3. When the gas reaches the cold exchange part 3, the cold in the cold collection tank 1 is used for cooling. The gas performs heat exchange with the cold in the cold collection tank 1 in the cold exchange part 3, and then the gas after cooling is transported to the molecular sieve 5 through the output port of the cold exchange part 3 for regeneration of the molecular sieve 5. The cold box 2 avoids the waste of cold resources by recycling the remaining cold for regeneration of the molecular sieve 5.

[0052] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0053] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A cold recovery device, applied to a cold box (2), characterized in that: include: A cold energy collection tank (1), the inlet of which is connected to the cold energy discharge port of the cold box (2) and is used to collect cold energy; A cold energy exchange pipe, comprising a cold energy exchange portion (3), wherein the cold energy exchange portion (3) is arranged in the cold energy collection tank (1); a heat exchange gas source (4), the output port of which is connected to the inlet port of the cold exchange portion (3) and delivers gas to the cold exchange portion (3); and The molecular sieve (5) is connected to the output port of the cold exchange part (3) so as to transport the gas cooled by the cold exchange part (3) to the molecular sieve (5).

2. The cold recovery device according to claim 1, characterized in that: Also includes: A gas heating element (6), the input port of which is connected to the gas outlet of the cold energy collection tank (1), and is used to heat the gas output from the gas outlet; The combustion element (7) has an input port connected to the output port of the gas heating element (6).

3. The cold recovery device according to claim 2, characterized in that: Also includes: An air temperature measuring meter (8) is arranged at the output end of the gas heating element (6) and is used to measure the temperature of the gas output by the gas heating element (6).

4. The cold recovery device according to claim 1, characterized in that: The cold exchange part (3) is a continuous spirally arranged pipe unit, and the pipe unit is in a spiral ascending or spiral descending shape to form a spiral pipe.

5. The cold recovery device according to claim 2, characterized in that: Also includes: A liquid level meter (9), whose sensing end is in contact with the liquid in the cold energy collection tank (1), is used to detect the liquid level of the liquid in the cold energy collection tank (1).

6. The cold recovery device according to claim 5, characterized in that: Also includes: A pressure gauge (10) is arranged in the pipeline between the gas heating element (6) and the cold energy collection tank (1) and is used to monitor the pressure of the cold energy collection tank (1).

7. The cold recovery device according to claim 1, characterized in that: Also includes: A stop valve (11) is arranged at the output end of the heat exchange gas source (4).

8. The cold recovery device according to claim 7, characterized in that: Also includes: A check valve (12) is arranged at the output end of the stop valve (11).

9. The cold recovery device according to claim 1, characterized in that: The pipeline between the heat exchange gas source (4) and the cold energy collection tank (1), and the pipeline between the cold energy collection tank (1) and the molecular sieve (5) are low-temperature pressure-resistant stainless steel pipelines.

10. A cold box, characterized in that: include: A cold recovery device as described in any one of claims 1 to 9.

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